code: def test_causal_refuter_bootstrap_test():
      estimator = CausalEstimate(
          None, None, None, 0, None, None, None, None
      )
      refuter = MockRefuter(
          None, IdentifiedEstimand(None, None, None), None
      )
      simulations = np.random.normal(0, 1, 5000)
      pvalue = refuter.perform_bootstrap_test(estimator, simulations)
      assert pvalue > 0.95
  
file_path: dowhy/tests/test_causal_refuter.py
imports: import numpy
  import pytest
  from flaky import flaky
  from dowhy.causal_estimator import CausalEstimate
  from dowhy.causal_identifier.identified_estimand import IdentifiedEstimand
  from dowhy.causal_refuter import CausalRefuter
label_desc: Use image node_id 2 for calling a global function with example usage: test_causal_refuter_bootstrap_test() without return types